- Goto android.ccpcreations.com/vlw or download the app - its called "Video Live Wallpaper"
- Get / make a movie in the correct format: 1280 x 720, mp4 H264 encoding seems to work fine, lasting 20 seconds.
- Long press on the desktop, and at the pop up select "Live Wallpapers" and just follow it through.
- If you want to have a go with 2 sample movies try this and this, made with the very excellent Artmatic. And another one I made.
Here's a YouTube video illustrating.